Optical head device including fixed and movable deflection means
US5777960A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 3, 1996 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | May 3, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/094
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical head device supports an objective lens which faces an optical disc movable in a tracking direction. Light is caused to be emitted from a fixed optical system to be converged through the objective lens and to be incident on the optical disc. The light reflected by the optical disc is incident on the fixed optical system via the objective lens. The head also controls a position of the objective lens in the tracking direction using a tracking error detected by the fixed optical system. A movable deflection member deflects a bundle of rays incident thereon in the tracking direction from the fixed optical system in a direction perpendicular to a focusing direction and also to the tracking direction. A fixed deflection member deflects the bundle of rays incident thereon from the movable deflection member in the focusing direction and causes the bundle of rays to be incident on the optical disc via the objective lens. A co-moving mechanism causes the movable deflection member to move integrally with the objective lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.